# Relationship history for MSHA mine 3102103

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Rowan Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Rowan Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Piedmont Quarries → Rowan Quarry; 1994-04-01 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Thomas E  Evans et al → Rowan Quarry; 1994-04-01 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Thomas E  Evans et al → Piedmont Quarries; 1994-04-01 to 1998-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Kurt M  Swenson → Rowan Quarry; 1997-11-01 to 2016-09-20; source msha-controller-operator-history
- **operator_operates_mine:** Carolina Quarries Inc → Rowan Quarry; 1998-11-04 to 2021-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Kurt M  Swenson → Carolina Quarries Inc; 1998-11-04 to 2016-09-20; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Rowan Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Rowan Quarry; 2016-09-21 to 2023-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2016-09-21 to 2021-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Rowan Quarry; 2021-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2021-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2021-04-08 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** TorQuest Partners Inc → Rowan Quarry; 2023-02-16 to 2023-08-31; source msha-controller-operator-history
- **controller_controls_operator:** TorQuest Partners Inc → Carolina Quarries Inc; 2023-02-16 to 2021-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Polycor Inc → Rowan Quarry; 2023-09-01 to 2026-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Polycor Inc → Carolina Quarries Inc; 2023-09-01 to 2021-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Rowan Quarry; 2026-01-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Carolina Quarries Inc; 2026-01-28 to 2021-04-07; source msha-controller-operator-history